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Migration of δ/γ Interface in Low Carbon Steels during Continuous Cooling

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Abstract

The δ-ferrite to γ-austenite phase transformation process of low carbon steel was observed in-situ under a confocal scanning laser microscope and the influence of manganese and chromium on the migration of δ/γ interphase boundary during the δ to γ phase transformation was studied. It was found that the δ/γ interphase boundary becomes unstable with the decrease of temperature, from planar to curved morphology during the δ to γ phase transformation of Fe-0.08C steel and Fe-0.08C-0.8Mn steel. But in Fe-0.08C-0.8Cr steel, the δ/γ interphase boundaries are stable with planar morphology during the whole δ-ferrite to γ-austenite transformation. The destabilization of δ/γ interphase boundary in Fe-0.08C and Fe-0.08C-0.8Mn steels results from high degree of supercooling and sub-boundaries in γ, respectively. The stabilization of δ/γ interphase boundary in Fe-0.08C-0.8Cr steel results from the slow diffusion rate of carbon atom induced by the addition of chromium.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou, Liaoning, 121000, China

    Qing-chun Li (Doctor, Associate Professor), Yong-feng Qi, Shu Xu, Chao Wang & Guo-wei Chang

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  1. Qing-chun Li
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  2. Yong-feng Qi
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  3. Shu Xu
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  4. Chao Wang
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  5. Guo-wei Chang
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Correspondence to Qing-chun Li.

Additional information

Foundation Item: Item Sponsored by National Natural Science Foundation of China (51204092); Open Project of Shanghai Key Laboratory of Modern Metallurgy and Materials Processing of China (SELF-2012-02)

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Li, Qc., Qi, Yf., Xu, S. et al. Migration of δ/γ Interface in Low Carbon Steels during Continuous Cooling. J. Iron Steel Res. Int. 21, 855–861 (2014). https://doi.org/10.1016/S1006-706X(14)60153-9

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  • DOI: https://doi.org/10.1016/S1006-706X(14)60153-9

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